Monotheism (Tawheed) was obligatory belief taught by past prophets

Without belief in Monotheism (Tawheed), good deeds are not accepted by Allah سبحانه وتعالى

Polytheism (Shirk; ascribing partners with Allah سبحانه وتعالى) is a sin that will not be pardoned by Allah سبحانه وتعالى

Prophet hood (Risalat) of Muhammad صلى الله عليه وسلم; second part of testimony of faith

Obedience of Prophet صلى الله عليه وسلم goes hand in hand with obedience of Allah سبحانه وتعالى

Dis-obedience and dis-respect of The Prophet صلى الله عليه وسلم results in dis-approval of good deeds

If pleasure of Allah سبحانه وتعالى is required, obey the prophet صلى الله عليه وسلم

Previous religious scriptures testified prophet hood of Muhammad صلى الله عليه وسلم

Establishment of Prayers (Salaah); an obligatory act for all Muslims

Establishment of Prayers (Salaah); characteristic of true believers